Hi there. I did not find mentioned attached file, but can estimate the amount of work to do with 3 tables.
My bid include new database design, if you also consider migration of data, add $200 more.
A few words about me: I have created 20+ large web development projects, including 10+ large projects
on this site (content management system, school management system, inventory DB, dating site, e-assesment, portals, recruiting site, Expedia-like vacation booking site, sport wagering site, several e-commerce shops of different complexity, E-Bay clone, secure file exchange network site).
14+ years in software development, Microsoft certified.